期刊
NANO LETTERS
卷 20, 期 4, 页码 2829-2836出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00545
关键词
CsPbI3 perovskite quantum dots; surface modification; zirconium acetylacetonate; efficiency roll-off; top-shitting light-emitting diodes
类别
资金
- National Natural Science Foundation of China [61722504, 61675086, 61935009, 51772123]
- National Key Research and Development Program of China [2017YFB0403601]
- Special Project of the Province-University Co-constructing Program of Jilin University [SXGJXX2017-3]
- Croucher Foundation of Hong Kong
- Talent Introduction Plan of Overseas Top Ranking Professors, State Administration of Foreign Expert Affairs [MSBJLG040]
Zirconium acetylacetonate used as a co-precursor in the synthesis of CsPbI3 quantum dots (QDs) increased their photoluminescence quantum efficiency to values over 90%. The top-emitting device structure on a Si substrate with high thermal conductivity (to better dissipate Joule heat generated at high current density) was designed to improve the light extraction efficiency making use of a strong microcavity resonance between the bottom and top electrodes. As a result of these improvements, light-emitting diodes (LEDs) utilizing Zr-modified CsPbI3 QDs with an electroluminescence at 686 nm showed external quantum efficiency (EQE) of 13.7% at a current density of 108 mA cm(-2), which was combined with low efficiency roll-off (maintaining an EQE of 12.5% at a high current density of 500 mA cm(-2)) and a high luminance of 14725 cd m(-2), and the stability of the devices being repeatedly lit (cycled on and off at high drive current density) has been greatly enhanced.
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